Example 9 - Chapter 3 Class 11 Trigonometric Functions

Last updated at April 16, 2024 by

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Example 9 Find the value of cos (–1710°). cos⁡(−1710°) = 𝒄𝒐𝒔⁡(𝟏𝟕𝟏𝟎°) = cos⁡(1710 ×𝜋/180) = 𝒄𝒐𝒔⁡(𝟏𝟗𝝅/𝟐) = cos⁡(𝟗 𝟏/𝟐 𝝅 ) = cos⁡(𝟏𝟎𝝅−𝝅/𝟐) = 𝒄𝒐𝒔⁡((−𝝅)/𝟐) = cos⁡((−180)/2) = cos⁡(–90°) = 𝒄𝒐𝒔⁡𝟗𝟎° = 0

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo